I came across a Horse Chestnut tree (also called Buckeye in some parts) earlier this year at a moment when the spiky green seed pods were at a very intriguing stage in their formation. They looked like what you might imagine a bacteria would look like under a powerful microscope, with an almost alien look. The lighting conditions were such that I was able to take few pictures in which the soft lighter green spikes really stood out against the background. Perhaps these images speak for themselves without further explanation.

Some of the little spiky balls had just formed from the flower stage and were not much larger than a marble.

I also got a couple of interesting shots of the Horse chestnut leaf margin (below) and the leaf stem.

In this image one can see how the Horse chestnut palmate leaf attaches to the stem. This is one good way to help distinguish this tree from the true Chestnut Castanea sativa.

It is Chestnut season once again which means that this is a good time to revisit the question of how to tell an edible Sweet Chestnut from a non-edible Horse Chestnut (also called Buckeye). I will first provide some images to help accurately identify the edible Sweet Chestnut and then I will provide some for the non-ebible Horse Chestnut.

The seed pods of the edible Sweet Chestnut are very easy to distinguish from the non-edible Horse Chestnut. Those of the edible chestnut are very "spiky" with sharp, pointy, needle-like spikes that are about 2cm long. The spikes completely cover the surface of the edible Sweet chestnut´s seed pod.

The seed pod of the non-edible Horse Chestnut (also called Buckeye) is quite different. It has short stubby points that are not as stiff nor as sharp as those of the edible Sweet Chestnut. It´s stubby spikes do not cover the whole surface of the seedpod and are only about half a centimeter in length.

The image below is of the Horse Chestnut seed outside of its seed pod. These round but somewhat irregular shaped seeds range in size from approx. 2-4 cm in diameter. One way to tell them apart from edible chestnuts is by the fact that these seeds have no pointy end whereas the edible Sweet Chestnuts always have a pointy end.

A word of caution for chestnut hunters who live in areas where both the Horse Chestnut and Sweet Chestnut trees grow. Don´t trust a chestnut just because you found it near or under a sweet chestnut tree. It is not uncommon for these two trees to grow in close proximity to each other in city settings. Edible chestnuts always come from very spiky seed pods and always have a pointy end on the seed.

About this blog

Exploring the World´s Tree Species is a blog focused on the tree species of the world and their importance to our everyday lives. It is estimated that there are about 10,000 unique tree species in the world. Most of us however can only name a handful of trees, which is understandable given that in any given area there are normally only a few dozen tree species prevalent. In this blog however my aim is to reveal interesting facts and images of tree species from all over the world. Given that I live in Spain and only travel occasionally to the United States and a few other countries the bulk of the trees blogged about will be from these places. I hope that by browsing through this blog you will come to enjoy the trees as much as I do.